Expand ing-man orel



(No ModeL) v G. SHELLEY.

EXPANDING MANDREL.-

Patented Feb. 3, 1885.

litres drarns .a'rnr rrrcn.

GEORGE SHELLEY, OF VVILKES-BARRE, PENNSYLVANIA.

EXPANDlNG h/IANDREL.

SFECIFICATIONforming par: of Letters Patent No. 311,788, dated February 3, 1885.

A1 plicniion filed December 18, 1883. ()To model To all whom, it may concern:

Be it known that I, GEORGE SHELLEY, a citizen of the United States, residing at \Vilkes- Barre, in the county of Luzerne and State of Pennsylvania, have invented certain new and useful ImprovementsinExpanding-Mandrels; and I do declare the following to bea full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in eXpanding-mandrels; and it consists in the novel construction, combination, and arrange ment of the several parts, as will be hereinafter described and claimed.

In the drawings, I igure 1 is a side view of my improved mandrel. Fi 2 is an end view of same. Fig. 3 is a side view of the cylinder with the keys in position. Fig. 4 is a detail perspective view of one of the keys. Fig. 5 is a transverse section of the barrel with the keys removed. Fig. 6 is a longitudinal section of the barrel with the keys in place; and Fig. -7 is a detail side view of one of thekeys, all of which will be described.

The arbor Ais of ordinary form, and tapered from end to end, as is usual. The cylinder or barrel B is fitted to be placed on, and its bore is tapered from end to end corresponding to, said arbor. Through this cylinder at suitable points in its circumference I form the radial slots B, preferably three, but which can be increased to any desired number, and which extend nearly from end to end of the cylinder. The keys 0 are fitted to these slots and placed therein as shown. One side of each of the keys is tapered longitudinally to correspond to the taper of the arbor, and is preferably curved transversely in order to better fit the said arbor, as will be seen from Figs. 2 and at.- These keys are provided with grooves or re cesses D, formed, preferably, in their ends, as shown. Studs or pins E are projected from the walls of slots B into said slot, with their points extended into the radial slots D on the keys 0. I prefer to form the pins or studs with threaded or screw portions, so they may be more readily placed in and removed from the cylinder, and I also prefer to project them from the end walls of the slots. This construction. it will be seen, will not interfere with the radial adjustment of the key in the manner presently described, and will prevent the keys from (1 r0 ppingout of the cylinder, whether the latter be on or off the arbor, thus preventing all danger of losing the keys, as will be appreciated.

It is obvious that instead of forming the grooves or recesses D in the ends of the keys they might be formed in their sides, as shown at m, Fig. 4, and the studs or pins be projected from the side walls of the slots I3 into said side grooves or recesses, as shown in Figs. 1 and 3; or the grooves or recesses might be formed in both the ends and sides. I prefer, however, to form the grooves in the ends of the keys, and also to pass the studs or pins through the ends of the cylinder, and to make said studs or pins removable, by screwthread or otherwise, so as to enable the removal of the keys for the purpose of substituting new ones for worn-out keys, or placing wider keys to fit large bores, or to change one or more of the keys when desired to turn eccentrics, cams, &c.

In operation it will. be understood the usual mandrel-opening is drilled in the piece of work which it is desired to turn. The arbor, with the sleeve attached, is then inserted in said mandrel-hole until the keys come opposite the work. The sleeve is then forced toward the large end of the arbor until it is held sufficiently tight to prevent slipping, as is well known in the art.

It will be seen that by use of the expanding attachments the arbor shown can be used to hold work the openings whereof vary in diameter from that of the smaller end of the arbor to the extreme point to which the keys may be spread radially; also, that by substituting one or more of the keys by one or more of different widths, eccentrics and cams may be turned, as willbe obviousto those skilled in the art.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s-

1. As an article of manufacture, the herein described attachment for mandrels or arbors, consist-ing of the cylinder or barrel. provided with longitudinal radial slots B, the keys placed and movable radially in said slots and formed with narrow radial grooves, and pins or studs projected from the walls of slots B, and having their points extended into the radial grooves in the keys, whereby the said keys are held from detachment from the barre], and yet permitted to move radially therein, all combined substantially as set forth.

2. The combination, with the arbor, of the cylinder B, having radial longitudinally-extended slots B, the keys 0, placed and movable radially in said slots, and having grooves D formed in their opposite ends, and the pins or studs projected from the Walls of slots B 1 and extended into the grooves D, whereby the keys 0 are held from detachment from the barrel, and yet permitted to move radially therein, substantially as set forth.

In testimony whereof I affix my signature 20 in presence of-two witnesses.

GEORGE SHELLEY.

Witnesses:

I. .0. DONNELLY, JAMES WALSH. 

